Hydraulic oil cooler having steps



FIG. 1 is a perspective view of a hydraulic oil cooler having steps, showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines show portions of the hydraulic oil cooler having steps that form no part of the claimed design. 

CLAIM The ornamental design for a hydraulic oil cooler having steps, as shown and described. 